Conventional permanent‑magnet drives struggle to deliver high torque density and ultra‑low iron losses in the tight packaging envelopes demanded by next‑generation e‑mobility and aerospace platforms. Researchers lack an open, replicable reference design to test advanced materials, winding schemes and control strategies.
Why this case study
This page introduces PPMT (Parallel Path Magnetic Motor), a 12‑pole research motor developed by Reinventy Solutions. We release a complete CAD model, geometry and bill of materials based on standard Fe‑Si laminations and copper windings.
Note: Reinventy’s proprietary know‑how concerns the composite material AeroMag™ and the advanced control electronics, which are not included in the open package. The shared prototype is a starting point for researchers to experiment with alternative stators, windings or custom firmware.
In 1888 Nikola Tesla presented “A New System of Alternate‑Current Motors and Transformers” to the American Institute of Electrical Engineers, describing the rotating magnetic field that underpins modern electric motors. That same year he secured patents US 381 968 – “Electro‑Magnetic Motor” and US 390 721 – “Dynamo‑Electric Machine” for polyphase synchronous and induction machines.
In the 1990s U.S. engineer Charles “Joe” Flynn filed patent US 5 455 474 – “Magnetic Motor Construction” (1995). Flynn showed that a small steering coil in a parallel magnetic path can divert permanent‑magnet flux with just a few dozen ampere‑turns, yielding four‑fold force gains over conventional solenoids.
This concept, later dubbed Parallel Path Magnetic Technology (PPMT), has been analysed by several academic and industrial teams, including the University of Latvia (Dirba & Kleperis, 2011) and QM Power Inc.
Reinventy’s PPMT motor continues this lineage, linking Tesla’s induction machines to Flynn’s controllable flux paths and today’s open‑source platform.
Tesla has contributed more to electrical science than any man up to his time..
Lord Kelvin, President of the Royal Society, address to the Institution of Electrical Engineers (1896)
Tesla legacy note: Tesla foresaw that electromagnetic machines would one day “operate with very high efficiency and minimal electric input, drawing their principal power from magnetic interactions in the motor itself” (Electrical Engineer, Aug 1891). PPMT embodies that vision by exploiting permanent‑magnet energy while requiring only milliwatts for flux steering.
PPMT uses two or more permanent magnets in parallel paths. A low‑power steering coil (0.3–0.5 W) shifts flux between paths, delivering:
Four‑times higher magnetic force for the same excitation energy;
High torque from zero speed with minimal heating;
The ability to hold position with zero current between actuation pulses.
Lab tests on linear and radial demonstrators confirm that, for the same magnets, PPMT delivers about four units of force with the coil on, versus two units in the neutral state.
12-pole PPMT motor architecture
| Parameter | Value |
|---|---|
| Stator diameter (Fe-Si laminations) | 180 mm |
| Number of poles | 12 |
| Magnets per pole | 1 (NdFeB N52 70 × 50 × 18.9 mm) |
| Flux per magnet | ≈ 5 mWb |
| Steering-coil voltage | 0.4 V dc (per coil) |
| Nominal coil current | 1 A |
| Coil resistance | 0.41 Ω |
| Excitation power (per coil) | 0.4 W |
| Peak torque (design) | > 120 Nm |
| Continuous speed range | 0 – 10 000 rpm |
| Target efficiency | > 90 % |
Magnet note – The 12 NdFeB blocks deliver a combined flux of ≈ 60 mWb. Their BHmax (N52) is ~0.46 MJ m⁻³, storing ~3.5 kJ of magnetic energy.
Steering coils – Each coil is 50 turns of bifilar copper Ø 0.8 mm (drawing 013-09-20-13). At 1 A it provides ~50 A-turns and a 0.1 T flux shift, enough to quadruple pole force.
Power balance – At 10 000 rpm and 120 Nm the theoretical mechanical power is ~126 kW. Electrical power for all coils is < 5 W (12 × 0.4 W), illustrating PPMT’s magnet-powered nature.
Rotor & stator build – The rotor stack (drawing 013-09-20-17) consists of laser-cut ferromagnetic laminations (0.35 mm ferrite-Si) pressed on a steel hub. Between each stator pair sits a radially oriented NdFeB magnet, as shown in the general assembly. The stators (0.35 mm ferrite-Si – drawing 013-09-20-11) are also laser-cut stacks clamped with brass tie-rods.
PPMT uses two or more permanent magnets in parallel paths. A low‑power steering coil (0.3–0.5 W) shifts flux between paths, delivering:
Four‑times higher magnetic force for the same excitation energy;
High torque from zero speed with minimal heating;
The ability to hold position with zero current between actuation pulses.
Lab tests on linear and radial demonstrators confirm that, for the same magnets, PPMT delivers about four units of force with the coil on, versus two units in the neutral state.
Operating parameters (summary)
| Item | Value |
|---|---|
| Coil resistance | 0.41 Ω |
| Nominal coil current | 1 A |
| Nominal coil voltage | 0.4 V |
| Power per coil | 0.4 W |
| Total steering power (12 coils) | 4.8 W |
| Single-magnet flux | 5 mWb |
| Total machine flux | 60 mWb |
| Peak torque (design) | > 120 Nm |
| Mechanical power @ 10 k rpm | ~126 kW |
Reinventy’s PPMT prototype translates the parallel‑path concept into tangible, real‑world gains for e‑mobility and industrial drives:
30 – 50 % CO₂ reduction on WLTP cycle versus equivalent motors;
High power density via Parallel Path topology and N52 magnets;
Near‑zero maintenance and silent operation;
Configurable for hybrid‑assist or full‑electric without gearboxes.
versus baseline
To help partners and research teams align their own development cycles, we publish a transparent, quarter‑by‑quarter schedule. Each milestone marks when specific deliverables—hardware builds, documentation drops, field‑test invitations—become available. The table gives a clear view of when you can download new design iterations, submit feedback, or transition from lab evaluation to pre‑series pilot production.
| Phase | Q2 2025 | Q3 2025 | Q4 2025 | 2026 |
|---|---|---|---|---|
| Lab prototype v1 | ||||
| Open Replication launch | ||||
| Community field test | ||||
| Industrial release PPMT v2 |
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• All specifications are preliminary and may change without notice; shared links should therefore cite the original URL.
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Email: ppmt@reinventy‑solutions.ca
Phone: +1 778 404 0050
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